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    <a href="../index.html">cppreference.com</a> &gt; <a href=
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    atof
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  <div class="syntax-name-format">
    Syntax:
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  <pre class="syntax-box">
  #include &lt;stdlib.h&gt;
  double atof( const char *str );
</pre>

  <p>The function atof() converts <em>str</em> into a double, then
  returns that value. <em>str</em> must start with a valid number, but
  can be terminated with any non-numerical character, other than
  &quot;E&quot; or &quot;e&quot;. For example,</p>
  <pre class="example-code">
   x = atof( &quot;42.0is_the_answer&quot; );           
</pre>

  <p>results in x being set to 42.0.</p>

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